Ok My first power stroke was a 1996 f250 no mods at all. Still have with 255XXX runs great but it was a 2 wheel drive extend cab....so i bought an 02 f250 crew 4x4. First off i love both of these trucks but the 02 is my favorite by far. Here is the issue the 02 is terrible on mpg. Did napa diy airfilter, edge tuner(i know they suck) tightend up all my boots and put on 4" exhaust staight pipes. My mpg is the same 50/50 highway city i get 12.5 solo....towing i get 10.5 (8K)......the towing miles i'm ok with its the solos i have an issue with. the mods gave me way more power but no mpgs. I'm thinking about tradeding to a newer v10.....gas is cheaper and my 02 is worth what a v10 06 goes for..........i work with some cumm heads and they are getting low 20's solo and high teens towing.

I would look at the condition of the injectors and their o-rings as said above before giving up on it. It's possible you have a bad injector and/or o-ring, another thing to check is the fuel bowl and the rest of the fuel system to ensure there are no leaks.

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